Join Date: Apr 2013
Location: BFE Kansas
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Sporadic Firing...PCM or IDM Issues?
A couple of weeks back my truck started firing a little weird. It wasn't misfiring, more that it was actually hitting harder on a certain cylinder, than it was on the other cylinders, but it was completely random. The best way I can describe it is kind of like when a points distributor gets water under it. Anyways, it wasn't that big of a deal, and it seemed to straighten out.
Well now a couple weeks later (yesterday), it was running like absolute crap. When I first started it in the morning, RPMs took ran up to like 1,000 rpm instead of its normal idle, and then it started running a little rough. On the way to work, it was lurching, and was trying to die on me sometimes at stop lights. When I got to work, I checked my VC plugs and my IPR plug to make sure everything was plugged in, and that "seemed" to fix it, but I think it was pure coincidence.
Today, I drove it to the plant that I normally work at (35 miles) and it was intermittently lurching. Sometimes it'd do it under light acceleration and it'd straighten out, then other times it'd randomly do it when cruising along. When I'm under light acceleration, I can hear my injectors change tone as if I switched my chip from my stock tune to my extreme tune (but I'm not changing anything). This may only be coincidence, but my radio also didn't turn at all (completely dead) during my 35 mile drive in this morning. Once I got to work, I shut it off and fired it right back up, and my radio kicked on no issues. It threw a CEL about halfway through the drive, but it cleared as soon as I shut the truck off.
Has anyone had similar symptoms? I'm thinking that I'll get it home this evening and pull my chip to see if that makes a difference, but after that I'm at a bit of a loss of diagnostics. Thanks for the help!